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sat_chen Group Title

integration of (sin^5x)*(cos^3x)dx

  • one year ago
  • one year ago

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  1. hartnn Group Title
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    split cos^3 x = cos x * cos^2 x write cos^2 x = 1- sin^2 x then its easy to see that u = sin x du =cos x dx.

    • one year ago
  2. sat_chen Group Title
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    so do you leave sin^5x as it is

    • one year ago
  3. hartnn Group Title
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    yes, then you'll use it... s^5 (1-s^2) c dx [s=sin, c=cos]

    • one year ago
  4. hartnn Group Title
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    s^5 (1-s^2) c dx = (s^5 -s^7) cdx

    • one year ago
  5. sat_chen Group Title
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    ah i see how that tricked me i tried to think it was a half angle formula or something

    • one year ago
  6. hartnn Group Title
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    so, now can you solve that integral ?

    • one year ago
  7. sat_chen Group Title
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    yea i can thanks a lot bro

    • one year ago
  8. hartnn Group Title
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    welcome ^_^

    • one year ago
  9. sat_chen Group Title
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    math not my best subject :P

    • one year ago
  10. hartnn Group Title
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    it became my best subject, after lot of practicing :)

    • one year ago
  11. sat_chen Group Title
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    1 question though can you split sin of x to solve also

    • one year ago
  12. hartnn Group Title
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    yes,but that will be more complicated....but yes.

    • one year ago
  13. sat_chen Group Title
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    ah i see ty again

    • one year ago
  14. sat_chen Group Title
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    if i need help again asking you :P

    • one year ago
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